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Texas Instruments ADS7813PB
- Part No.:
- ADS7813PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7813PB.pdf
- Description:
- IC ADC 16BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,166
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Product details
Overview
ADS7813PB from Texas Instruments is a low-power, single +5V supply, 16-bit sampling analog-to-digital converter (ADC) based on capacitor-based successive approximation register (SAR) architecture. It delivers 40kHz throughput, ±2.0LSB max INL, 87dB min SINAD, and supports multiple input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V - used in precision medical instrumentation and industrial control data acquisition systems.
For engineers reviewing the ADS7813PB datasheet, ADS7813PB pinout, ADS7813PB application, or ADS7813PB equivalent, key selection considerations include its 20µs max conversion time, internal/external reference flexibility, SPI-compatible serial interface with dual clocking modes (internal DATACLK or external DATACLK), 50µW power-down mode, and DIP-16 package compatibility with legacy ADS7812 designs.
Technical Context
The ADS7813PB integrates a complete SAR ADC core with on-chip sample/hold, internal +2.5V reference (±8ppm/°C drift), reference buffer (BUF), and compensation node (CAP). Its analog front-end supports high-impedance inputs (>10MΩ) and tolerates overvoltage up to ±16.5V without damage across R1IN/R2IN/R3IN pins.
It implements a flexible serial interface where EXT/INT pin selects between internally generated DATACLK (synchronized to conversion) or externally supplied clock; DATA output is MSB-first Binary Two's Complement, valid on both edges of DATACLK in internal mode and falling edge in external mode. Timing is specified over –40°C to +85°C at 40kHz sampling rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR - delivers 1 LSB = 305µV for ±10V range, enabling sub-millivolt measurement fidelity |
| Conversion Time | 20 µs max - defines minimum inter-conversion interval for 40kHz sustained throughput |
| INL | ±2.0 LSB max - ensures monotonicity and <0.003% full-scale linearity error in calibrated systems |
| SINAD | 87 dB min - supports >14-bit effective resolution at 1kHz input under specified conditions |
| Power Dissipation | 35 mW max at 40kHz - enables thermally constrained embedded DAQ designs |
| Power-Down Mode | 50 µW - reduces standby current by >99% vs active operation for battery-sensitive applications |
| Reference | Internal +2.5V (±8ppm/°C) or external 2.3V–2.7V - allows system-level reference sharing or enhanced stability |
Pinout & Package
ADS7813PB is packaged in a 0.3" wide 16-pin plastic DIP (Dual In-line Package), pin-compatible with ADS7812P and suitable for through-hole prototyping and industrial PCBs requiring long-term mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4 (R1IN/R2IN/R3IN) | Analog Input Terminals | Configurable differential/single-ended inputs; connection topology determines input range (e.g., R1IN→VIN, R2IN→BUF, R3IN→GND = ±10V range) |
| 2, 8 (GND) | Analog/Digital Ground | Separate ground pins minimize noise coupling; require low-inductance star grounding for optimal AC performance |
| 5 (BUF) | Reference Buffer Output | Provides buffered +2.5V for input resistor biasing; must connect to R1IN/R2IN/R3IN per selected range |
| 6 (CAP) | Reference Buffer Compensation Node | Requires 1µF tantalum || 0.01µF ceramic to ground; ESR ≤3Ω critical for INL stability |
| 7 (REF) | Reference Input/Output | Outputs internal +2.5V via 4kΩ series resistor; accepts external 2.3–2.7V reference to override internal source |
| 9 (DATACLK) | Serial Clock I/O | Output when EXT/INT = LOW (internal clock); input when EXT/INT = HIGH - controls DATA timing alignment |
| 10 (DATA) | Serial Data Output | MSB-first Binary Two's Complement; tri-stated when CS = HIGH; valid on both DATACLK edges (internal mode) |
| 11 (EXT/INT) | Serial Clock Source Select | LOW = internal DATACLK derived from conversion clock; HIGH = external clock required for serial readout |
| 12 (CONV) | Convert Trigger Input | Falling-edge initiated; starts conversion regardless of CS state; must be static during t2–t5 window to avoid noise injection |
| 13 (CS) | Chip Select | Active-low enable for all digital outputs (DATA, DATACLK, BUSY); does not inhibit CONV-triggered conversions |
| 14 (BUSY) | Conversion Status Output | Active-low open-drain signal; LOW during entire conversion + serial transfer; serves as frame sync in internal DATACLK mode |
| 15 (PWRD) | Power-Down Control | Active-high; places core into 50µW state; requires CONV = LOW before assertion for minimum quiescent current |
| 16 (VS) | +5V Supply Input | Must be decoupled with 0.1µF ceramic || 10µF tantalum; ripple sensitivity degrades INL/DLE at >100Hz frequencies |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed 16-bit monotonicity across full temperature range - eliminates data gaps in closed-loop control |
| Multiple input ranges | 12+ configurable voltage spans (e.g., ±10V, 0.5V–4.5V, high-Z 0.3V–2.8V) via R1IN/R2IN/R3IN resistor network - reduces need for external signal conditioning |
| Overvoltage tolerance | ±16.5V absolute max on R1IN/R2IN/R3IN - protects against transient surges in industrial sensor interfaces without external clamping |
| Flexible serial interface | Dual-clocking mode (internal/external DATACLK) and CS-controlled tri-state outputs - simplifies integration with microcontrollers lacking dedicated SPI peripherals |
| Low power consumption | 35mW active / 50µW power-down - enables portable and energy-harvested DAQ systems with extended battery life |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: High-fidelity ECG and EEG signal digitization in portable diagnostic devices requiring low noise and DC accuracy. IC Role / Device Role / Timing Role: Primary 16-bit SAR ADC capturing analog biosignals at 40kHz with ±10V input range and internal reference stability. Use Value: 87dB SINAD and ±2LSB INL ensure clinical-grade waveform fidelity; 50µW power-down extends battery runtime between patient measurements. |
Use Scenario: Modular rack-mounted DAQ modules for factory floor monitoring of temperature, pressure, and vibration sensors. IC Role / Device Role / Timing Role: Precision front-end ADC supporting multiple input ranges (±5V, 0–10V) and tolerant of industrial ground noise and transients. Use Value: ±16.5V overvoltage rating eliminates need for external protection circuitry; DIP-16 package enables field-replaceable module design. |
| Industrial Control | Test Equipment |
Use Scenario: Closed-loop servo position feedback in CNC machinery using analog resolver or LVDT outputs. IC Role / Device Role / Timing Role: High-speed 16-bit ADC providing real-time position data with minimal latency (20µs conversion) and no missing codes. Use Value: Monotonic 16-bit output prevents control instability; internal reference eliminates calibration drift in unattended 24/7 operation. |
Use Scenario: Benchtop multimeters and automated test equipment requiring traceable DC accuracy and AC performance verification. IC Role / Device Role / Timing Role: Calibration-grade ADC with 87dB SINAD and 89dB SNR used in metrology subsystems for signal integrity validation. Use Value: Specified INL/DLE across –40°C to +85°C enables one-time factory calibration; CAP/BUF pin configuration supports metrology-grade reference decoupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7813U | SO-16 surface-mount package; identical electrical specs and pinout; same –40°C to +85°C rating | Preferred for automated PCB assembly and space-constrained designs; lacks DIP mechanical robustness for serviceable modules | Select ADS7813U when board area and reflow compatibility outweigh field-serviceability requirements |
| ADS8320EB | 16-bit SAR ADC with 100ksps throughput, SPI interface, and integrated reference; SO-8 package; no DIP option | Higher speed but incompatible pinout and interface timing; requires PCB redesign and firmware adaptation | Choose ADS8320EB only when 100ksps sampling is mandatory and layout revision is feasible |
Compared with ADS7813U and ADS8320EB, the ADS7813PB offers unique DIP-16 through-hole compatibility with legacy ADS7812 footprints, enabling drop-in upgrades in existing medical and industrial DAQ hardware without layout changes - while maintaining identical DC accuracy, AC performance, and power-down behavior.
Availability
ADS7813PB is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, and test equipment requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for ADS7813PB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade ICs.
The ADS7813PB belongs to TI's precision SAR ADC product line, designed specifically for high-accuracy, low-power data acquisition in medical, industrial, and test equipment where DC integrity, AC performance, and long-term reliability are critical.
FAQ
What is the maximum sampling rate supported by the ADS7813PB?
The ADS7813PB is specified for a maximum throughput rate of 40kHz across its full operating temperature range (–40°C to +85°C). This corresponds to a 25µs complete cycle time (acquisition + conversion), with a maximum conversion time of 20µs. The device achieves this rate using its internal clocking architecture and maintains full 16-bit accuracy and monotonicity at this speed. Exceeding 40kHz may degrade INL, SINAD, or cause missing codes.
Does the ADS7813PB require an external reference voltage?
No, the ADS7813PB includes an internal +2.5V reference with ±8ppm/°C drift and 2.48V–2.52V initial tolerance, sufficient for most precision applications. However, it also supports external references from 2.3V to 2.7V applied to the REF pin - enabling higher system-level accuracy or reference sharing across multiple ADCs. The internal reference remains active unless an external voltage is present.
How does the ADS7813PB handle overvoltage conditions on its analog inputs?
The ADS7813PB tolerates analog input voltages up to ±16.5V on R1IN, R2IN, and R3IN without damage - exceeding typical industrial transient limits. This ruggedness is achieved through internal protection structures and is validated across the full –40°C to +85°C range. However, accurate conversion is only guaranteed within the selected input range (e.g., ±10V); overvoltage recovery time is 750ns after a 2× full-scale step.
Can the ADS7813PB be used as a direct replacement for the ADS7812 in existing designs?
Yes, the ADS7813PB is pin-compatible with the 12-bit ADS7812P in DIP-16 packaging and shares identical pin functions and timing interfaces. Firmware must be updated to read 16 bits instead of 12, and system gain/offset calibration may require adjustment due to the higher resolution. No PCB changes are needed, making it a seamless upgrade path for enhanced measurement fidelity.
What are the power supply decoupling requirements for stable ADS7813PB operation?
The ADS7813PB requires a 0.1µF ceramic capacitor in parallel with a 10µF tantalum capacitor between VS (Pin 16) and GND (Pin 2 or 8). Additionally, the CAP pin (Pin 6) needs a 1µF tantalum || 0.01µF ceramic to ground, and the REF pin (Pin 7) requires a 1µF–2.2µF tantalum capacitor to ground. These values are critical for achieving specified INL, SINAD, and reference stability - especially under dynamic load conditions.
ADS7813PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7813PB FAQ
1.How can I place an order for ADS7813PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7813PB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7813PB reliable?
The price and inventory of ADS7813PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7813PB is usually 5 days.
3.What payment methods are accepted for ADS7813PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7813PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7813PB?
ADS7813PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7813PB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7813PB?
For technical support, including ADS7813PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7813PB requirements.
6.How does Aetrix verify that ADS7813PB is sourced from the original manufacturer or authorized distributors?
All ADS7813PB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7813PB meets industry standards.
7.What is the process for return or replacement of ADS7813PB?
All ADS7813PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7813PB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7813PB part is unused and in its original packaging.
Return procedure for ADS7813PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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